Quantifying electrical spin injection: Component-resolved electroluminescence from spin-polarized light-emitting diodes

Citation
Bt. Jonker et al., Quantifying electrical spin injection: Component-resolved electroluminescence from spin-polarized light-emitting diodes, APPL PHYS L, 79(19), 2001, pp. 3098-3100
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
79
Issue
19
Year of publication
2001
Pages
3098 - 3100
Database
ISI
SICI code
0003-6951(20011105)79:19<3098:QESICE>2.0.ZU;2-E
Abstract
The spin-polarized light-emitting diode (spin-LED) is a very effective tool for accurately quantifying electrical spin injection in a model independen t manner. We resolve and identify various components which occur in the ele ctroluminescence (EL) spectra of GaAs quantum-well-based spin-LEDs, and exa mine the circular polarization of each. While a number of components exhibi t significant circular polarization, the values do not necessarily reflect the electrical spin injection efficiency. We show that a reliable measure o f spin injection efficiency can be obtained only if one takes care to spect roscopically resolve and accurately identify the free exciton or free carri er components of the EL spectrum, and exclude other components. (C) 2001 Am erican Institute of Physics.